Good afternoon, I'm trying to display a listview using an async task, and I have limited success in displaying the list. the situation is this, I have an activity that is already displayed, and when the user clicks the button, he begins to perform gps actions to get the user's location through an asynchronous task. now I want to display a list containing the results of geocoding so that the user can select the desired location and then update it to a text view in action. I am having trouble displaying this list. it does not appear at all.
here is the corresponding code:
public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.view_location); }
Async Task Class:
class locationTask extends AsyncTask<Object, Void, List<Address> > { List<Address> addresses; ProgressDialog progressDialog; Activity location_activity; public locationTask(Activity activity){ location_activity = activity; } protected void onPreExecute(){ progressDialog = ProgressDialog.show(LocationViewer.this, "", "Getting GPS information Location here"); } protected List<Address> doInBackground(Object... params){ Log.d(TAG, "am in doinbackground now"); addresses = doGeoCode(globalLocation); int count = addresses.size(); Log.d(TAG, "count in doinbackground = " + count); Log.d(TAG, "am out of doinbackground now"); return null; } @Override protected void onPostExecute(List<Address> address){ progressDialog.dismiss(); int count = addresses.size(); Log.d(TAG, "count = " + count); Log.d(TAG, "am in PostExecute now"); locationAdapter adapter = new locationAdapter(LocationViewer.this, android.R.layout.simple_list_item_1, addresses); adapter.notifyDataSetChanged(); list.setAdapter(adapter); } }
doGeocode method:
public List<Address> doGeoCode(Location location){ globalLocation = location; double newlatitude = globalLocation.getLatitude(); double newlongitude =globalLocation.getLongitude(); Geocoder geocode = new Geocoder(this, Locale.getDefault()); try{ addresses = geocode.getFromLocation(newlatitude, newlongitude, 1); } catch(IOException e){} return addresses;
Adapter Class:
class locationAdapter extends ArrayAdapter<Address> { Context mycontext; public locationAdapter(Context context,int textViewResourceId, List<Address> addresses) { super(context,textViewResourceId, addresses); mycontext = context; } @Override public View getView(int position, View convertView, ViewGroup parent){ int maxAddressLineIndex = getItem(position).getMaxAddressLineIndex(); String addressline = ""; for(int j=0; j <= maxAddressLineIndex; j++){ addressline += getItem(position).getAddressLine(j) + ","; } TextView rowAddress = new TextView(mycontext); rowAddress.setText(addressline); return rowAddress; } } public void onItemClick(AdapterView<?> parent, View view, int position, long id) { StringBuilder sb = new StringBuilder(); sb.append(((Address)parent.getItemAtPosition(position)).getAddressLine(position)).append(","); sb.append(((Address)parent.getItemAtPosition(position)).getAdminArea()).append(";"); sb.append(((Address)parent.getItemAtPosition(position)).getPostalCode()).append(";"); sb.append(((Address)parent.getItemAtPosition(position)).getCountryName()); address = sb.toString(); }
LogCat:
11-18 11:47:18.538: VERBOSE/LocationManagerService(1350): requestLocationUpdates 11-18 11:47:18.548: DEBUG/WifiService(1350): enable and start wifi due to updateWifiState 11-18 11:47:18.588: INFO/System.out(1459): [INFO:467227473]: LogSource: Running flush 11-18 11:47:18.588: INFO/System.out(1459): [INFO:467227475]: LogSource: Sending payload [bytes=247] 11-18 11:47:18.648: INFO/System.out(1459): [INFO:467227537]: LogSource: Response [http=200,length=219] 11-18 11:47:18.648: INFO/System.out(1459): [INFO:467227538]: LogSource: Read id 119, status code 200 11-18 11:47:18.688: DEBUG/InputManagerService(1350): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@408a9630 11-18 11:47:18.858: DEBUG/SurfaceFlinger(1350): layer=0xb8fdb8 is not in the purgatory list 11-1811:47:19.529: INFO/wpa_supplicant(1548): got scan complete 11-18 11:47:19.529: INFO/wpa_supplicant(1548): wpa_supplicant_get_scan_results:return scan results2 11-18 11:47:19.529: INFO/wpa_supplicant(1548): AP:ssid[ICYSPICY],rssi[-53],BSSID=00:1c:df:73:b2:6c 11-18 11:47:19.529: INFO/wpa_supplicant(1548): AP:ssid[virginmedia2196134],rssi[-91],BSSID=c4:3d:c7:41:12:f3 11-18 11:47:19.529: INFO/wpa_supplicant(1548): AP:ssid[ICYSPICY],rssi[-85],BSSID=00:24:b2:b4:8b:f8 11-18 11:47:19.529: INFO/wpa_supplicant(1548): Received 950 bytes of scan results (3 BSSes) 11-18 11:47:19.529: INFO/wpa_supplicant(1548): wpa_driver_wext_get_scan_results